The neutrino event IceCube 170922A, detected at the IceCube Neutrino Observatory at the South Pole,appears to originate from the distant active galaxy TXS 0506+056.Multiwavelength flaring, observed from the radio to the TeV-regime,is a regular phenomenon of BL Lac objects or blazars.While many other blazers show properties similar to those of TXS 0506+056,only TXS 0506+056 has been identified as neutrino emitter so far.In the talk I will explain that the enhanced neutrino activity duringthe neutrino flare in 2014–2015 and the single EHE neutrinoIceCube-170922A could have been generated by a cosmic collision within TXS 0506+056.Our findings seem capable of explaining the neutrino generation at the time of a low gamma-ray fluxand also indicate that this AGN might be an atypical blazar.